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Pressure at a Depth in a Liquid

The total are...

Question

The total area of wings of an aeroplane is $10 m^{2}$ . The speed of air above and below the wings is $140 m / s$ and $110 m / s$ . Then the force on the aeroplane by air is?
$(ρ_{A} = 1.28 \frac{K g}{m^{3}})$ .

48750 N

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48000 N

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95000 N

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50000 N

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Solution

The correct option is B $48000 N$
Pressure = $\frac{F o r c e}{A r e a}$
So Force = Pressure $\times$ Area
= $\frac{1}{2} \times 1.28 \times (140^{2} - 110^{2}) \times 10$
= 48000 N

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